@article{SM_1978_34_1_a3,
     author = {E. V. Sallinen},
     title = {Extremal problems on classes of quasi-conformal homeomorphisms},
     journal = {Sbornik. Mathematics},
     pages = {99--109},
     publisher = {mathdoc},
     volume = {34},
     number = {1},
     year = {1978},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1978_34_1_a3/}
}